NSK7218CTDBC7P5Angular Contact Ball Bearing – 90 mm ID, 160 mm OD, 30 mm Width, Open, 15° Contact Angle, Back-to-Back Matched Pair, ABEC 5.

Product Description

What this part is

NSK 7218CTDBC7P5 super-precision angular contact ball bearing, 90 mm bore × 160 mm outside diameter × 30 mm width. Series: 7200. Contact Angle: 15°. Precision Class: P5, ABEC 5. Supplied as a back-to-back matched pair, 2 pieces, open on both faces.

Decoding the designation

Base Number: 7218C. C: 15° contact angle. DB: back-to-back matched arrangement, 2 bearings. C7: preload class. P5: ISO Class 5, ABEC 5. The number is also written 7218-CT-DB-C7-P5, 7218C T DBC7 P5 and 7218CT DBC7 P5.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity. A back-to-back pair sets the load lines apart, which carries moment loads and holds a shaft axially in both directions. Basic Dynamic Load Rating: 155 kN per bearing. Basic Static Load Rating: 105 kN per bearing. Limiting Speed: 9,000 rpm on grease, 11,000 rpm on oil or oil-air. Mass: 2.20 kg per bearing.

Quantity and configuration

Two bearings, ground and matched as a back-to-back set. Total width of the pair: 60 mm. Preloaded matched sets are supplied without a running clearance. Bearing Material: high carbon chrome steel.

Fitting notes

The pair is fitted as a unit, marked faces together, with the outer rings clamped in the housing and the inner rings clamped on the shaft to hold the set preload.

Interchange guidance

SKF 7218 CD/P5 in a back-to-back matched pair covers the same envelope and angle. FAG B7218-C-P5-UL is a related size on the same envelope, supplied as a universally matchable single. A 7218A on the same envelope carries a 30° contact angle and is a related size.